diff --git a/definitions/dimensions.yaml b/definitions/dimensions.yaml
index 98b3880ea..9e0c3c515 100644
--- a/definitions/dimensions.yaml
+++ b/definitions/dimensions.yaml
@@ -55,9 +55,9 @@
   positive: down
 
 - specifier: depthsed
-  long_name: Depth of Vertical Layer Center Below water-sediment interface
+  long_name: Vertical Sediment Layer Index
   standard_name: depth_below_bottom
-  units: m
+  units: '-'
   axis: Z
   positive: down